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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
Symptoms, signs and diseases resulting from too much iron (iron overload): chronic fatigue ; joint pain ; abdominal pain; liver disease (cirrhosis, liver cancer) diabetes mellitus ; irregular heart rhythm ; heart attack or heart failure ; skin color changes (bronze, ashen-gray green) loss of period ; loss of interest in sex ; osteoarthritis; osteoporosis; hair loss